35/50 - Ethylene

Ethylene is a colorless flammable gas with a sweet odor when pure. Ethylene is used in the chemical industry, and has the largest production out of all organic compounds. It's also an important natural plant hormone that's used in agriculture to force the ripening of fruits.

34/50 - Epithelial tissue

Epithelial tissue is an animal tissue that lines the cavities and surfaces of structures throughout the body and forms many glands. Some functions of epithelial cells are secretion, selective absorption, protection and detection of sensation.

33/50 - Homeostasis

Homeostasis is the property of a system that regulates its internal environment and maintains a stable or constant condition like temperature. It's a process where the body's internal environment is kept stable. An advantage of homeostasis is that it allows an organism to function properly in a variety of environmental conditions.

32/50 - Hermaphrodite

A hermaphrodite is an organism that has reproductive organs of both male and female sexes. Many invertebrates do not have separate sexes and hermaphroditism is a normal condition for them which enables sexual reproduction where both partners can act as the "female" or "male". Some snails and slugs are hermaphrodites along with some species of fish. Most plants are hermaphrodites too.

31/50 - Gametophyte

A gametophyte is a multicellular stage in land plants and algae that forms in the life cycle. A gametophyte produces gametes through the cell division of spores. Gametophytes also produce male, female or both gametes during mitosis. The female and male gametes are also called, respectively, egg cells and sperm cells.

30/50 - Enzyme

Enzymes are large molecules responsible for thousands of chemical reactions that support life. Most enzymes are proteins. Enzymes have a specific structure that can create organic and inorganic components to assist in catalysis.

29/50 - Endosperm

Endosperm is the tissue produced inside the seeds of most flowering plants. It surrounds the embryo and provides nutrition in the form of starch and can also contain oils and protein. This makes endosperms a source of nutrition in plants and humans.

28/50 - Connective tissue

Connective tissue is a tissue that supports, connects or separates other types of tissues and organs in the body. Some functions of connective tissue are storage of energy, protection of organs, connection of body tissues and connection of epithelial tissues to muscle fiber.

27/50 - Calvin cycle

In the calvin cycle plants use energy from the sun in chloroplasts and they convert the sun's energy into a storable form for sugar molecules like glucose. Carbon dioxide and water are combined to form the more ordered sugar molecules.

26/50 - Bilateral symmetry

Organisms that are bilateral symmetry can be divided vertically into left and right halves. Most animals are bilaterally symmetric. In nature and biology, symmetry is approximate and rarely match up exactly when folded in half.

25/50 - Auxin producing area of a plant

Auxin is a class of plant hormones that play a big role in the growth and behavior in plants. They were one of the first major plant hormones to be discovered. Auxin is a key factor for plant growth, reacting to its environment and the development of plant organs like leaves and flowers.

24/50 - Asexual reproduction

Asexual reproduction is a way to reproduce where the offspring comes from a single parent and inherits the genes of that parent only. The offspring will be exact genetic copies of the parent, except in some specific cases. Asexual reproduction is the primary form of reproduction for single-celled organisms, and many plants and fungi reproduce asexually as well.

23/50 - Xylem

Xylem is a types of transport tissue in vascular plants, and the best-known xylem tissue is wood found throughout plants. Its main function is to transport water and it also transports some nutrients through the plant as well.

22/50 - Phloem

Phloem is the living tissue that carries organic nutrients in vascular plants. The phloem is in charge with the transport of organic material made during photosynthesis, this is called translocation.

21/50 - Sporophyte

A sporophyte is a generation of a plant or alga that has a double set of chromosomes. The sporophyte produces spores by meiosis and they develop into a gametophyte. Both the spores and the gametophyte only have one set of homologous chromosomes. The gametophyte produces male, female or both gametes by mitosis and the combining of male and female gametes produces a zygote that develops into a new sporophyte.